CHAPTER 13 TROUBLESHOOTING
13-114
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Cause
HVT-DC PCB
Primary charging
grid plate
High-voltage
cable
HVT-DC PCB
Post-cleaning
charging assembly
High-voltage
cable
Laser exposure
system
Photosensitive
drum
Environment
sensor
CPU PCB
Action
Fit the assembly
properly.
Mount the grid plate
properly.
Check the grid high-
voltage cable.
Replace the HVT-DC
PCB.
Fit the assembly
properly.
Clean or fit the charging
wire properly.
Replace the post-
cleaning charging
assembly.
Check the post-cleaning
high-voltage cable.
Replace the HVT-DC
PCB.
Check the shutter
assembly.
Clean it.
Adjust the laser power.
If output is absent,
replace the laser unit or
the laser driver.
Check the
photosensitive drum for
grounding; if normal,
replace the
photosensitive drum.
Check the environment
sensor according to the
instructions under 7.
"Checking the
Environment
Measurement PCB."
Replace the CPU PCB.
Step
9
10
11
12
13
14
15
16
17
18
19
Yes/No
NO
NO
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
Checks
Is the primary charging assembly
fitted properly?
Is the grid plate of the primary
charging assembly mounted
properly?
Is there electrical continuity from
the grid plate of the primary
charging assembly to the high-
voltage transformer (HVT-DC)?
Is the post-cleaning charging
assembly fitted properly?
Is the post-cleaning charging wire
broken or soiled?
Are there traces of leakage in the
post-cleaning charging assembly?
Is there electrical continuity from
the post-cleaning charging
assembly to the high-voltage
transformer (HVT-DC)?
Is the movement of the laser shutter
normal?
Is the dust-proofing glass or the
bending mirror soiled?
Is the laser power normal? (See the
descriptions given for how to adjust
the laser power.)
Check the temperature and
humidity in service mode
(COPIER>DISPLAY>ANALOG>
TEMP/HUM). Are the readings
normal?
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